These points are also on the negative side of the x axis, at -pi/4 and -pi/2. When we move along the x axis, notice what happens to the y value. On the left side of zero, tangent is negative. At x=-pi/4, tangent=-1.
The Independent Online. David Cameron may have called a referendum on the EU to blackmail Europe, according to Vladimir Putin. The Russian president also questioned Mr Cameronâs decision to call the vote, as it has caused a âgreat problemâ.
What Obama told Putin. The White House posted the readout of yesterdayâs phone call with Vladimir Putin regarding Russiaâs invasion of the Crimean peninsula. The readout is limited to Obamaâs side of the conversation. For an educated guess about what Putin had to say, check out Paul Mirengoffâs adjacent post.